This document is essential reading for every user of the NAG fl90
implementation specified in the title. It provides implementation-specific
detail that augments the information provided in the NAG fl90 Manual.
Wherever that manual refer to the "Users' Note for your implementation", you
should consult this note.

NAG recommends that you read the following minimum reference material before
calling any library procedure:

All procedures listed in the chapter contents documents of the NAG fl90
Manual, Release 4 are available in this implementation. At Release 4, 43 new
primary ("user-callable") generic procedures have been introduced. Please
consult the Release 4 News document in the fl90 Manual for lists of
these procedures and for a list of procedures scheduled for withdrawal at
future Releases. Your suggestions for new algorithms for future releases of the
Library are welcomed (see Section 7).

Assuming that libnagfl90.a has been installed in a directory in the search path
of the linker, such as /usr/lib, and that the module information files have
been moved to /usr/local/lib/fl90_modules, then you may link to NAG fl90
in the following manner:

The example programs are most easily accessed by the command nagexample, which
will provide you with a copy of an example program (and its data, if any),
compile the program and link it with the library (showing you the compile
command so that you can recompile your own version of the program). Finally,
the executable program will be run, presenting its output to stdout. The
example program concerned is specified by the argument to nagexample, e.g.

nagexample nag_gen_lin_sys_ex01

will copy the example program and its data into the files
nag_gen_lin_sys_ex01.f90 and nag_gen_lin_sys_ex01.dat in the current directory
and process them to produce the example program results.

Any further information which applies to one or more procedures in this
implementation is listed below.

(a) Special Functions

Special functions will give error messages if called with illegal or unsafe
arguments. General details are given in the NAG fl90 Manual, but
parameter limits which are implementation-specific are given below:

Each supported NAG fl90 site is currently provided with a printed copy
of the NAG fl90 Manual (or Update). Additional copies are available for
purchase; please refer to the NAG documentation order form (available on the
NAG websites, see Section 6 (c)) for details of current
prices.

(a) Contact with NAG

Queries concerning this document or the implementation generally should be
directed initially to your local Advisory Service. If you have difficulty in
making contact locally, you can contact NAG directly at one of the addresses
given in the Appendix. Users subscribing to the support service are encouraged
to contact one of the NAG Response Centres (see below).

(b) NAG Response Centres

The NAG Response Centres are available for general enquiries from all users and
also for technical queries from sites with an annually licensed product or
support service.

The Response Centres are open during office hours, but contact is possible by
fax, email and phone (answering machine) at all times.

The NAG websites are an information service providing items of interest to
users and prospective users of NAG products and services. The information is
reviewed and updated regularly and includes implementation availability,
descriptions of products, downloadable software, product documentation and
technical reports. The NAG websites can be accessed at

(d) NAG Electronic Newsletter

If you would like to be kept up to date with news from NAG you may want to
register to receive our electronic newsletter, which will alert you to special
offers, announcements about new products or product/service enhancements, case
studies and NAG's event diary. To register visit one of our websites or contact
us at nagnews@nag.co.uk.

Many factors influence the way NAG's products and services evolve and your
ideas are invaluable in helping us to ensure that we meet your needs. If you
would like to contribute to this process we would be pleased to receive your
comments by email at
feedback@nag.co.uk. Alternatively
contact the appropriate NAG Response Centre who will be happy to record your
comments.